Subaru Legacy IV (2008 year). Manual - part 803

6MT-25

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

18663AA000

SOCKET

Used for removing and installing the transfer 
bearing holder.

18853AA000

HEIGHT GAUGE

Used for selecting the shift rod.

18760AA000

CLAW

• Used for removing the front side retainer bear-
ing outer race.
• Used together with PULLER ASSY 
(398527700).

18675AA000

DIFFERENTIAL 
SIDE OIL SEAL 
INSTALLER

Used for installing the differential side retainer oil 
seal.

28399SA010

OIL SEAL 
PROTECTOR

Used for protecting oil seal when installing front 
drive shaft.

ILLUSTRATION

TOOL NUMBER

TOOL NAME

REMARKS

ST18663AA000

ST18853AA000

ST18760AA000

ST18675AA000

ST28399SA010

6MT-26

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

2. GENERAL TOOL

18657AA020

OIL SEAL 
INSTALLER

Used for installing the oil seal.

18270KA020

SOCKET (E20)

Used for removing and installing the hypoid 
driven gear.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance, voltage and current.

TORX

®

 bit T70

Used for removing and installing transmission gear oil drain plug.

Depth gauge

Used for measuring the transmission end play.

ILLUSTRATION

TOOL NUMBER

TOOL NAME

REMARKS

ST18657AA020

ST18270KA020

6MT-27

Transmission Gear Oil

MANUAL TRANSMISSION AND DIFFERENTIAL

2. Transmission Gear Oil

A: INSPECTION

1) Park the vehicle on a level surface.
2) Turn the ignition switch to OFF, and wait until the
engine cools.
3) Remove the oil level gauge and wipe it clean.
4) Reinsert the level gauge all the way. Be sure that
the level gauge is correctly inserted in the proper
direction.
5) Pull out the oil level gauge again, and check the
oil level. If it is at the lower level or less, add oil
through the oil level gauge hole to bring the level up
to the upper level.

B: REPLACEMENT

1) Pull out the oil level gauge.
2) Lift up the vehicle.
3) Drain transmission gear oil completely. 

CAUTION:
• Immediately after the engine has been run-
ning, the transmission gear oil is hot. Be careful
not to burn yourself.
• Be careful not to spill the transmission gear
oil on exhaust pipe to prevent it from emitting
smoke or causing fires. If transmission gear oil
is spilled on the exhaust pipe, wipe it off com-
pletely.

NOTE:
• Tighten the drain plug of the transmission gear
oil after draining the transmission gear oil.
• Be sure to use a new gasket.
• Use  TORX

®

 bit T70 to remove and install the

drain plug on clutch housing side.

Tightening torque:

Oil pan side

50 N·m (5.1 kgf-m, 36.9 ft-lb)

Clutch housing side

70 N·m (7.1 kgf-m, 51.6 ft-lb)

4) Lower the vehicle.
5) Pour transmission gear oil through the gauge
hole.

Recommended gear oil

GL-5 (75W-909) or equivalent

Transmission gear oil capacity

4.1 

2

 (4.3 US qt, 3.6 Imp qt)

6) Check the level of the transmission gear oil.

NOTE:
Keep the transmission gear oil level to be between
the range marked on the level gauge.

(A) Oil level gauge

(B) Upper level

(C) Lower level

MT-00449

(A)

(A)

(B)

(C)

(A) Drain plug (Oil pan side)

(B) Drain plug (clutch housing side)

MT-01549

(A)

(B)

6MT-28

Oil Seal

MANUAL TRANSMISSION AND DIFFERENTIAL

3. Oil Seal

A: INSPECTION

Inspect for oil leakage from the oil seal. If there is
any deformation, hardening, wear or other malfunc-
tions of the oil seal, perform the following:
• Replace the oil seal.
• Inspect the propeller shaft.

B: REPLACEMENT

1) Clean the transmission exterior.
2) Drain transmission gear oil completely. <Ref. to
6MT-27, REPLACEMENT, Transmission Gear
Oil.>
3) Remove the rear exhaust pipe and muffler.
<Ref. to EX(H4DOTC)-12, REMOVAL, Rear Ex-
haust Pipe.> <Ref. to EX(H4DOTC)-14, REMOV-
AL, Muffler.>
4) Remove the heat shield cover. (If equipped)
5) Remove the propeller shaft. <Ref. to DS-10, RE-
MOVAL, Propeller Shaft.>
6) Remove the oil seal using ST.
ST

398527700

PULLER ASSY

7) Using the ST, install the oil seal.
ST

498057300

INSTALLER

8) Install the propeller shaft. <Ref. to DS-11, IN-
STALLATION, Propeller Shaft.>
9) Install the heat shield cover. (If equipped)
10) Install the rear exhaust pipe and muffler. <Ref.
to EX(H4DOTC)-13, INSTALLATION, Rear Ex-
haust Pipe.> <Ref. to EX(H4DOTC)-14, INSTAL-
LATION, Muffler.>
11) Pour in the transmission gear oil and check the
oil level. <Ref. to 6MT-27, REPLACEMENT, Trans-
mission Gear Oil.>

(A) Oil seal

MT-00451

(A)

ST

MT-00099